Questions tagged [hvac]

(Heating, Ventilating, and Air Conditioning) For questions about installing, repairing, and troubleshooting HVAC systems.

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1answer
68 views

Window a/c struggles in the late afternoon

I recently purchased a 12,000 btu window air conditioning for a 400 square foot room. The unit works great, until the late afternoon around 4pm, where it struggles to bring down the temperature to a ...
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2answers
39 views

HVAC Condensate draining into crawlspace

I recently purchased a home that had been remodeled by the previous owners. They installed a new furnace and A/C unit in the basement crawlspace. Initially, the crawlspace was dry and everything ...
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1answer
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New blower motor seem to be running too slow

I just replaced the blower motor on an older Lenox system. Black high speed wire. White and blue medium wire. The blower seems to be running much slower than expected. Not sure where to go from here. ...
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1answer
37 views

30' HVAC Duct Run - Booster Fan Viability?

I have a 2 story house, 4000 sq. ft, that has two furnaces in the basement. The first floor heats and cools okay. The second floors, 2/3's of the upstairs nearest to the furnace gets sufficient ...
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1answer
47 views

What will i need to remove Nest's from home?

I just moved into a house that has Nest temperature controllers in both the upstairs and downstairs. I don't plan to have any wifi in the home and I want to replace Nest with hvac controllers that ...
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1answer
49 views

Hooking up AC compressor to an old Lennox furnace

I'm trying to connect an ac compressor to an old Lennox G12Q3-110-3 furnace. Tried it a couple of ways and can either get the compressor to turn on or the furnace fan. Not both. Any ideas on how to ...
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2answers
53 views

Breaker setup for Trane 4 ton heat pump variable speed air handler without heat strips

I have a Trane heat pump 4 ton xr-16 and associated heat pump. The air handler is wired to a double pole (240v) 60 Amp breaker. Since I do not intend to install heat strips (ever - I have a better ...
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1answer
47 views

Basement AC too cold

I live with my daughter and her family in my own basement area consisting of bedroom, living room and bathroom. I have overhead vents for the AC, and with the basement usually being cool, when the AC ...
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2answers
91 views

Blower will not run in fan only mode

I am trying to determine why my blower motor will run when the thermostat calls for AC and Heat but it will not run when I switch the thermostat it to fan only. I recently replaced the old Honeywell ...
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3answers
58 views

Poor airflow to 2nd floor registers

Is there a way to increase airflow to the 2nd story air vents? I have tried closing the vents on the 1st floor but doesn't help. It just stays too hot upstairs and hardly any air comes out of the ...
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9answers
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Can I gain AC efficiency by spraying condensate water on the outdoor coils?

Last year with entirely too much time on my hands due to government-imposed shutdowns and quarantines, I was working from the basement and I noticed tonnes of condensate water going down the drain, ...
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2answers
241 views

Different fuses on dual-line disconnect for AC compressor

Please forgive the novice question... one of the two 10A/250V fuses blew on the disconnect to my AC compressor unit (photo 1). I went to the big box store and they only had 20A and 30A fuses so I got ...
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1answer
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Does the blower fan move when the AC window unit is set to fan mode?

I wonder if the blower fan works or spins when the AC unit is set to fan mode (no cooling). I do not know much about AC units, though from what I read AC window units contain two fans which are the ...
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0answers
25 views

Thud-like sound coming from AC Window Unit

I have this very old AC Window unit. I service it every year without issues, though this year after servicing it, it worked fine for around a month but the cooling got reduced a bit. My main issue ...
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1answer
52 views

Refrigerant coolant Line is Leaking

Yesterday only, I noticed that a whistling sound coming from Refrigerant coolant Line. Its in basement. I think its coming from inside. what could be the problem ?
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1answer
49 views

How do I stop these NOVENT caps on my air conditioner from rattling?

These purple caps on my AC condenser are rattling. They are stamped NOVENT. They just spin when I turn them. How do I tighten them to make them stop rattling?
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0answers
15 views

Nest Thermostat wiring for heat pump

I am trying to replace my Honeywell Thermostat that is connected to a Honeywell EIM with a Nest Thermostat. I only have a 4 wire (G,B,R and W) ran from the EIM to the thermostat. My understanding is I ...
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1answer
71 views

What is this sealing material inside a duct collar?

Most of the duct dampers don't provide 100% seal from air flow. The below picture might be. I have collar with damper, But its just not enough to stop/bypass the air flow. what is this called in the ...
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1answer
18 views

Attic Fan for Carrier 58STX110--14122

I have a Carrier furnace in my attic (Model 58STX110--14122). Does this unit include an attic fan? There is a fan that used to turn on during the day when it's hot and turns off when temperatures ...
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0answers
35 views

Problem with AC low voltage

My AC won’t turn on and the thermostat is not functioning properly. Voltage reading at the thermostat fluctuates between 7-9 volts. No low voltage at the contacter. I am still getting 240 at the ...
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1answer
58 views

Soundproofing external HVAC

I am looking to build a fence around my outside air conditioning unit to reduce the decibels for the neighbors. Is there any tips on how to construct such unit? Are there any ready to use commercial ...
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1answer
41 views

A/C not working after changing thermostat

I replaced my Lux thermostat with Honeywell RTH6360D1002 sometime ago and the heating worked very well. Now I am trying to use the AC and it is not working. I removed four wires from my old ...
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2answers
63 views

What is recommended Return air Grill location in a Basement?

I have to install a cold return air register in my basement ( of 8' ceiling). right now I have two options. In the picture, I have shown two options A & B. which is better in term of return cold ...
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1answer
42 views

Family installed a new Nest thermostat without photos of old wiring. Please help rewire 4-wire system to restore AC functionality!

Photo Album of current furnace, setup, and wiring: https://imgur.com/a/VYa2MnT Hi guys, I'm in town visiting my family for the summer. They installed a Nest thermostat without taking any photos of the ...
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2answers
73 views

One branch of my HVAC receives zero airflow, is there a design flaw with this layout?

Question: Why would the 6" duct (represented by the red X) produce almost zero airflow? I have a small piece of tissue attached to it to see that it's barely blowing anything. However, the blue ...
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1answer
48 views

Does a vent register boot always has to be installed parallel to wall for a better air flow all around?

In my basement, I have a gas pipe (1" diameter) running between the joists. There is a reason why I have choose this cavity to run a supply line from where. But I am end up using a end boot ...
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0answers
49 views

Why is the aux indicator on my HVAC system lighting up when A/C is called for?

HVAC novice. New professionally installed heat pump (Goodman) and air handler. Old thermostat from the early 90’s. No aux heater installed. My assumption is the landlord wanted to save money and in CA ...
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1answer
49 views

Main Line into House 1" OD Copper, what fitting

The main line coming into my house is 7/8 inch copper, .99 OD. I can't find any 7/8 fittings other than a reducer to 3/4. Seems like a 1 inch fitting would be to big, whats on there now is tight ...
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2answers
23 views

Can a HVAC be split between bonus room and garage, but with return and Tstat in bonus room?

I have an insulated garage and bonus room above it. Can a HVAC feed both the bonus room and garage, but the bonus room have the air return and Tstat? The bonus room is accessible from inside the house,...
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1answer
69 views

How can I insulate a duct running through an unconditioned kneewall space?

Unfortunately, I have to run an 8 inch HVAC duct through an unconditioned kneewall attic in southern Ontario (climate zone 6). I am trying to decide between two options: Encapsulate duct with spray ...
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1answer
39 views

What material should I use to hide a duct running just above the floor in a closet?

I have an 8-inch HVAC duct running along the back corner of a closet (4 feet wide) at ground level. I assume a good way to hide it would be to build a frame of 2x4s. However, while drywall would work ...
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0answers
30 views

Confused about HVAC wires

My townhome is using a heat pump and it's currently connected to a honeywell 3000 thermostat. I bought a gen 3 nest and from what I can tell, it's compatible. However, I'm a bit confused about my ...
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1answer
45 views

HVAC outdoor unit dead

Woke up this morning to this message from the thermostat: I can click that message away and it then it appears to call for cool. The air handler turns on but no cooling. The outdoor unit shows no ...
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0answers
22 views

Fresh Air Ventilation Humidity Issues

We moved in a few months ago to a new construction home and had noticed very high humidity inside our house, sometimes about 70-80%. When moving in the builders explained to us about the fresh air ...
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1answer
28 views

Is it safe to have a heating vent covered by a gas range/oven

I moved into a house where I discovered the central air floor vent is directly under a freestanding gas range/oven. I can feel the forced air coming through the burners. Since it's a slab foundation ...
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0answers
32 views

Heat pump not draining; barely cooling & smells bad

I have a Panasonic heat pump system for heating and cooling. The inverter unit is an R410A. I can't get access to the outdoor unit (I'm a tenant and it's in another part of the building). This is my ...
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0answers
36 views

In long run, Which is the best way to connect a flex duct to a Take Off Start Collar?

Please, Please vote up to a right answer. I found in the internet, Connecting a flex duct to take off start collar/ connect still a debatable, I need an answer from people of this community. Thanks! ...
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0answers
51 views

Partial power out when AC is on

Anytime our AC is on we lose power in a few rooms mostly the kitchen. It can be on a few days before it goes out. I’ve had 2 electricians come they both said electric panel looks great , we did ...
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2answers
42 views

Can I Take off from top and side of a trunk line under same bay?

Could you please help me. There is an article about 2 foot rule of take off. https://hvactoday.com/0719-two-foot-rule/ In my case, There is already an existing take off from the top , can i directly ...
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0answers
24 views

Help with switching the wires from heat to AC

I can’t remember which wire to move to switch from heat to AC. I remember it was very simple, I believe just one wire. (I thought grey?) This is a old unit, but it still works good. I’m not sure if ...
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0answers
40 views

which is better placement of flex duct in this case?

In the below picture. I have two options to run 1st flex duct. I am running 5 inch flex duct. Option 1 : Between joists where gas pipe is running, Here I would be able to use End Boot only. does the ...
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2answers
91 views

How can I bend 180 degrees over a duct trunk with height restriction?

I have to run a flex duct from opposite side of main trunk, as other side of the trunk in the direction flex duct is running is not accessible. This is in basement, I am using start collar with damper ...
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1answer
28 views

R and C wiring for Air Handler and Zone Panel

First time posting a question! But have been reading the questions/answers here for a while now. Ok- so I have a brand new Goodman Heat Pump system (GSZC + AVPTC air handler) I’ve installed in my ...
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1answer
91 views

Can I tilt a window air conditioner at 15 degrees when not in use?

I'm trying to design a frame for a window ac that will allow me to easily move the unit in and out of the window. (mostly for security reasons - I want to be able to close the window properly at night....
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1answer
31 views

Venting a basement range hood

I have a new range hood located in close proximity to the through the roof vent for the furnace and hot water tank; can I tap into that vent pipe for the range hood?
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1answer
33 views

Return air balancing

I have a 3 level townhouse, there is a damper controlling flow to each floor. My main concern is the number of vents on my upper level. One master bedroom (with bath), 2 smaller bedrooms, and another ...
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1answer
23 views

Water Leak Detector Recommendations - Adjustable Volume and Easy to Silence [closed]

To make a long story short I have an HVAC unit in a small rental property that leaks condensate and in order to apply a fix, we first must catch the leak in the act to better understand root cause. My ...
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1answer
73 views

Is there a minimum for spacing between take-offs from an HVAC trunk line?

I have to add 3 take offs from my main HVAC supply/trunk. Is there a minimum amount of distance I should maintain between each of the take offs? What should I do if I don't have the minimum distance ...
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1answer
76 views

Top to furnace flue just blew off

Sorry if this is posted in the wrong area. Just a moment ago during a storm the top to my furnace flue blew off. Earliest someone can get out here to put it back on it Tomorrow. How much damage will I ...
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1answer
56 views

How can I tell hot from neutral on the power cord of an evaporative cooler?

I have an Essick 4700 CFM cooler, where the power cord was cut and had a custom 3-prong attached, to trim the cable length. I detached the prong when winterizing, not realizing that this cable doesn't ...

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